background.js

/* KnightSense background service worker
   - Opens the welcome / landing page on first install
   - Routes the stealth keyboard command to the active Chess.com tab
*/
const WELCOME_URL = chrome.runtime.getURL('welcome.html');

chrome.runtime.onInstalled.addListener((details) => {
  if (details.reason === 'install') {
    chrome.tabs.create({ url: WELCOME_URL, active: true });
  } else if (details.reason === 'update') {
    // Keep returning users informed of the new build via the welcome page.
    chrome.tabs.query({ active: true, currentWindow: true }, (tabs) => {
      const cur = tabs && tabs[0];
      if (cur && cur.url && cur.url.indexOf('chess.com') !== -1) {
        // Don't yank a user out of a game — show it only on non-chess pages.
        return;
      }
      if (cur && cur.url && cur.url.indexOf(chrome.runtime.id) !== -1) {
        return; // already on an extension page
      }
      chrome.tabs.create({ url: WELCOME_URL, active: false });
    });
  }
});

// Keyboard shortcut: toggle overlay visibility in the active tab.
chrome.commands.onCommand.addListener(async (command) => {
  if (command !== 'toggle-overlay') return;
  const [tab] = await chrome.tabs.query({ active: true, currentWindow: true });
  if (!tab || !tab.id || !tab.url || tab.url.indexOf('chess.com') === -1) return;
  try {
    await chrome.tabs.sendMessage(tab.id, { type: 'TOGGLE_OVERLAY_HIDDEN' });
  } catch (e) {
    // No content script on that page yet — safe to ignore.
  }
});

// A badge mini-status so the user sees the extension is live on Chess.com.
chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
  if (changeInfo.status === 'loading' || !tab.url) return;
  if (tab.url.indexOf('chess.com') !== -1) {
    chrome.action.setBadgeBackgroundColor({ color: '#ffaa00', tabId });
    chrome.action.setBadgeText({ text: 'ON', tabId });
  } else {
    chrome.action.setBadgeText({ text: '', tabId });
  }
});